Jensen only had one scene in this episode, 4x02 "Gone." The scene is either incredibly sweet or very creepy, depending on your disposition. After Lana leaves Jason a note saying she's leaving France and going home, he follows her to Smallville to be with her and to get an explanation.

Aw. Anyway, the next episode has Jensen all over the place, so that one might take me a while to compile. In the meantime, I can leave you a very hot promo pic of him from the next episode. (Thanks to andreas_ri for them:

Aw, why can't I have a hot Jensen stalker? You know, stalkers really are only fun if they're attractive. :p But I think I do see his point. They roll around in France for what? An entire summer? And then she thinks she can go home with just a note to say goodbye? That's cold. On the other hand, whatever happened to calling someone? LOL!